USA Constitution Preamble
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
CSA Constitution Preamble
We, the people of the Confederate States, each State acting in its sovereign and independent character, in order to form a permanent federal government, establish justice, insure domestic tranquillity, and secure the blessings of liberty to ourselves and our posterity invoking the favor and guidance of Almighty God do ordain and establish this Constitution for the Confederate States of America.
So then the USA would be a Christian Nation in the sovereign and independent character of all States.
Well, the Government has been in the Practice of suppressing a Certain Way of Expressing America, haven't they? Perhaps Puritan Pilgrims, fleeing Moderate Persecution under the Anglicans, followed Cromwell's motto "God is King", to create a new City on a Hill Homeland, to a new Promised Land, "hail Columbia" "my Country tis of Thee", with "Manifest Destiny" to the west Coast. They further converted the nation to Presbyterianism. They finally broke the ancient enemy from the start of the Protestant Reformation in World War 1, the Austrian Hapsburgs. They are far and inbetween promoting the historical extension of the Christian outlook of America.